Diet Traps 1-4

The Sugar-Packed Snack: Yogurt

Brace yourself for culture shock. Plain yogurt naturally contains about 16 grams of sugar per cup. But if you eat flavored yogurt, you could be downing 15 or more additional grams of sugar, which is like shoveling in four extra teaspoonfuls.

Slim Strategy
Choose plain, low-fat yogurt and stir in a teaspoon of honey, maple syrup, or all-fruit spread for a hint of sweetness. Or opt for fat-free Greek yogurt, which is lower in sugar than even regular plain yogurt but often has double the protein to keep you satisfied longer.

The Tricky Treat: Sugar-Free Cookies and Candy

Don't fall for the no-sugar scam: When manufacturers remove the sweet stuff, they often add fat. One popular brand offers chocolate-chip cookies that each contain 160 calories and 9 grams of fat, so why not eat the real thing? You might save calories with sugar-free candy, but many contain sorbitol, which can cause bloating and diarrhea.

Slim Strategy
Get your cookie fix with graham crackers, which have almost a teaspoon less sugar per serving than many other packaged cookies. Or find a 100-calorie snack pack of your favorite (try Keebler Fudge Shoppe Mini Fudge Stripes). Taking a trip to candy land? Grab a 60-calorie Tootsie Pop or a York Peppermint Pattie (140 calories and 2.5 grams of fat).

The Backpack Bad Guy: Trail Mix

Store-bought versions of this hiking staple should take a hike. A 1-ounce handful of banana chips packs 10 grams of fat (they're usually deep-fried), and yogurt-covered raisins are coated with partially hydrogenated palm kernel oil, which contains saturated and trans fats.

The Mediocre Munchie: Veggie Chips

The rainbow-hued chips are no better than their potato counterparts. While both may boast a little vitamin A or C, your hips won't know the difference: The salty snacks have about 150 calories and 9 or 10 grams of fat per handful. And that bag may contain plain old chips in disguise; sometimes manufacturers simply add food coloring to potato flour.

Slim Strategy
Be sure your chips list a vegetable, not potato flour or corn flour, as the first ingredient (we like Terra Chips) and stick with just one portion. Or skip them in favor of baked tortilla chips: Pair a serving (about 12 chips) with 1/2 cup of salsa; you'll quell your crunch craving and get a full serving of veggies with only 153 nearly fat-free calories.

Diet Traps 5-10

The Cereal Saboteur: Granola

Pancakes drowned in syrup, eggs swimming in hollandaise sauce — is there a healthy option on the brunch menu? Granola seems harmless, but it's no breakfast of champions. One cup contains up to 560 calories and 28 grams of fat before you add milk.

Slim Strategy
Reluctant to give up that sweet, nutty taste? Skip granola at restaurants, where you can't control your portion. Enjoy it at home by mixing a quarter cup into a cup of low-cal, whole-grain cereal, such as All-Bran Complete Wheat Flakes, or sprinkle a tablespoon on oatmeal.

The Fishy Take-Out: Sushi

Say sayonara to the trendy American-style sushi rolls. They're stuffed with high-cal ingredients like cream cheese, mayo, and shredded cheese. And remember that tempura is simply another way of saying "'battered and fried."' One shrimp tempura roll (just six pieces of sushi) contains about 500 calories and 20 grams of fat.

Slim Strategy
Look for the basics — fish, rice, seaweed, vegetables — and skip creamy sauces. Sashimi (sliced raw fish, no rice) and nigiri (raw fish with rice) are safe, as are cucumber rolls. Order a side of protein-rich edamame to fill you up.

The Liquid Lunch: Smoothies

Sure, you'll get your fruit servings. You'll also fit in a meal's worth of calories, and in some cases, way more fat than you think (17 grams in one popular chain's 16-ounce chunky strawberry smoothie). Even if you substitute one for breakfast, you're pushing your calorie limit: Some smoothies weigh in at 500 calories.

Slim Strategy
Pick the smallest size available, and avoid high-cal mixers like frozen yogurt, sherbet, sorbet, and especially peanut butter and granola. One good bet at Jamba Juice: the Berry Fulfilling (150 calories). Pair it with a low-fat cheese stick or a hard-boiled egg for an on-the-go breakfast or midafternoon snack.

The Sneaky Sip: Diet Drinks

That can of zero-calorie soda glued to your palm may be your waistline's worst enemy: Research from the University of Texas Health Science Center at San Antonio found that people who drink artificially sweetened beverages gained more weight than those who didn't, possibly because the sweet flavor may trigger cravings for the real thing. In another study, soda sippers were more likely to develop metabolic syndrome, a cluster of conditions including high blood pressure and ab fat that raises heart-disease risk.

Slim Strategy
Reserve diet soda for an occasional treat. Get your fizz fix from seltzer or sparkling mineral water, such as San Pellegrino.

The Villainous Vinaigrette: Fat-Free Salad Dressing

Without fat, your salad is dressed for diet success, right? Wrong. Your body needs fat to absorb certain nutrients in veggies. In a study in the American Journal of Clinical Nutrition, people who used fat-free dressings didn't absorb any lycopene or beta-carotene, two health-boosting antioxidants.

Slim Strategy
Get an oil-based, reduced-fat dressing (usually 2 to 4 grams of fat per 2 tablespoons) that contains heart-healthy oils like olive and canola. Or make your own by whisking together 2 teaspoons of olive oil, 1 1/2 tablespoons of balsamic vinegar, 1/2 teaspoon of Dijon mustard, and a pinch of minced garlic.

The Foul Fowl: Ground Turkey

It seems like a no-brainer for burgers and lasagna, but ground turkey often includes fat and skin. A 3-ounce serving can contain 13 grams of fat — almost triple the amount in lean ground beef. With 40-plus percent of your day's worth of cholesterol, regular ground chicken is no better.